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采用高真空磁控钨极电弧熔炼炉制备铸态Zr_(49)Co_(49)Ti_2合金,对铸态试样进行加热至不同温度后水冷的热处理,采用X射线衍射仪和光学显微镜观察试样相组成和显微组织形态,利用万能试验机对试样进行力学性能测试。结果表明:Zr_(49)Co_(49)Ti_2合金在不同热处理温度条件下,其相结构主要由简单立方结构B2型ZrCo相组成,显微组织由等轴晶体和细条状晶体所组成。在773 K进行热处理的合金试样具有最大的线弹性极限和屈服强度值,其值分别为346 MPa和427 MPa;而在823 K进行热处理的合金试样具有最大维氏硬度,其值为337 HV20。另外,在完全塑性区域,随着热处理温度的增加,应变强化指数逐渐增大,即试样塑性变形抗力逐渐增大。
The as-cast Zr_ (49) Co_ (49) Ti_2 alloy was prepared by high vacuum magnetron tungsten arc arc furnace. The as-cast samples were heated to different temperatures and then cooled by water. The samples were observed by X-ray diffractometer and optical microscope Phase composition and microstructure, the use of universal testing machine mechanical properties of the test sample. The results show that the phase structure of Zr49 Co49Ti_2 alloy is mainly composed of simple cubic structure B2 ZrCo phase under the different heat treatment temperature. The microstructure consists of equiaxed and strip-shaped crystals. Alloy samples heat-treated at 773 K had the largest linear elastic and yield strength values of 346 MPa and 427 MPa, respectively; whereas the alloy samples heat-treated at 823 K had the largest Vickers hardness of 337 HV20. In addition, in the complete plastic region, as the heat treatment temperature increases, the strain hardening exponent gradually increases, that is, the plastic deformation resistance of the sample gradually increases.